Sometimes, not even the best windshield wipers are effective in bad weather. Splashes from other cars can also make it impossible to see out your windshield. Driving when you can’t see the road is dangerous but there is something you can do to improve windshield visibility. Applying a windshield water repellent will make it easier to see when it’s raining. However, not all products are created the same. Some improve windshield wiper function, while others are designed to repel water.